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Transport-Layer.md

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(以上的报文段中都可带选项)
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**为什么需要四次挥手?**
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## TCP状态转换
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![](pics/TCP状态转换.png)
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![](pics/TCP状态转换.png)
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建立连接:
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* TCP初始化时状态为`CLOSED`, 如果是主动打开方会快速发送一个SYN转换为`SYN_SENT`状态,如果是被动打开方,会快速转换为`LISTEN`状态。
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* `LISTEN`状态收到SYN后,返回一个SYN+ACK,进入`SYN_RCVD`状态。

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